Let me play catch up.
HD598 - NEEDS an amp. I won't stress this enough. It's not as sensitive as people lead you to believe. For gaming use, the Mixamp will be fine.
32ohm Beyers are VERY insensitive for that ohm rating, and will also benefit quite a bit from amping. Seriously felt it needed almost as much as the 600ohm, though didn't distort the way the 600ohm did with underamping.
DT770 Pro 80 - Unless you love a whopping amount of bass, you might wanna skip this. It has a LOT of sub bass, you've been warned. Outside of the bass bloat, yes it performs amazingly well with Dolby Headphone. Easiest in terms of locating rear positioning. Actually felt it didn't require as MUCH amping as the 32ohm Beyers. Mind does not compute.
Wireless Mixamp - Just as good as the wired Mixamp (though it does have minor hiss at loud volumes, the wired one doesn't, though it's a non-issue for the most part), but quite costly. MAKE SURE to buy the Astro rechargeable battery pack. Just....trust me. This thing eats batteries, and non-astro branded rechargeables won't charge via USB. Save yourself the hassle.
These recommendations for those not inclined to read the first page:
For MOSTLY gaming:
Headset: PC360 (seriously, if you need a mic'd headset, this is worth it).
Headphone: HD598 (I recommend it over the K701 due to it not needing the supah juice the way the AKG K70x does, but outside of gaming, you will want amping)
Gaming Amps: Mixamp or AX720
Don't expect a reply, since I'm not really active on this forum anymore. My last post prior to this one was almost 20 days ago, so there you have it...
Edited by Mad Lust Envy - 7/27/11 at 9:45pm